a multiple of the granular allocation. For a 512-byte allocation, the average unused space is 256 bytes. For 64 KB clusters, the average unused space is 32 KB.

Generally, the allocation unit size is set when the storage is configured. Choosing a relatively small size compared to the files stored results in excessive access overhead.Choosing a relatively large size results in excessive unused space.Choosing an allocation size based on the average size of files expected to be in the storage tends to minimize unusable space.

Fragmentation

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